/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/FaceGroupUtil.h
Count number of tris in each group in Mesh; TODO: does this need sparse storage?
namespace FaceGroupUtil { void FaceGroupUtil::CountAllGroups ( const [FDynamicMesh3](API\Runtime\GeometryCore\DynamicMesh\FDynamicMesh3) & Mesh, [TArray](API\Runtime\Core\Containers\TArray)< int32 > & GroupCountsOut ) }